DM74LS573N - National Semiconductor

TL/F/9814

DM74LS573 Octal D Latch with TRI-STATE Outputs

June 1992

DM74LS573

Octal D Latch with TRI-STATEÉOutputs

General Description

The ’LS573 is a high speed octal latch with buffered com-

mon Latch Enable (LE) and buffered common Output En-

able (OE) inputs.

This device is functionally identical to the ’LS373, but has

different pinouts. For truth tables, discussion of operations

and AC and DC specifications, please refer to the ’LS373

data sheet.

Features

YInputs and outputs on opposite sides of package

allowing easy interface with microprocessors

YUseful as input or output port for microprocessors

YFunctionally identical to ’LS373

YInput clamp diodes limit high speed termination effects

YFully TTL and CMOS compatible

Connection Diagram

Dual-In-Line Package

TL/F/9814–1

Order Number DM74LS573WM or DM74LS573N

See NS Package Number M20B or N20A

Logic Symbol

TL/F/9814–2

VCC ePin 20

GND ePin 10

Pin Names Description

D0– D7 Data Inputs

LE Latch Enable Input (Active HIGH)

OE TRI-STATE Output Enable Input (Active LOW)

O0– O7 TRI-STATE Latch Outputs

Function Table

OUTPUT Latch DOutput

Enable Enable O

LHHH

LHLL

LLXQ

HXXZ

Low State, H eHigh State, X eDon’t Care

ZeHigh Impedance State

QOePrevious Condition of O

TRI-STATEÉis a registered trademark of National Semiconductor Corporation.

C1995 National Semiconductor Corporation RRD-B30M115/Printed in U. S. A.

Absolute Maximum Ratings (Note)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales

Office/Distributors for availability and specifications.

Supply Voltage 7V

Input Voltage 7V

Operating Free Air Temperature Range

DM74LS 0§Ctoa

70§C

Storage Temperature Range b65§Ctoa

150§C

Note:

The ‘‘Absolute Maximum Ratings’’ are those values

beyond which the safety of the device cannot be guaran-

teed. The device should not be operated at these limits. The

parametric values defined in the ‘‘Electrical Characteristics’’

table are not guaranteed at the absolute maximum ratings.

The ‘‘Recommended Operating Conditions’’ table will define

the conditions for actual device operation.

Recommended Operating Conditions

Symbol Parameter DM74LS Units

Min Nom Max

VCC Supply Voltage 4.75 5 5.25 V

VIH High Level Input Voltage 2 V

VIL Low Level Input Voltage 0.8 V

IOH High Level Input Current b2.6 mA

IOL Low Level Output Current 24 mA

TAFree Air Operating Temperature 0 70 §C

Electrical Characteristics

Over recommended operating free air temperature range (unless otherwise noted)

Symbol Parameter Conditions Min Typ Max Units

(Note 1)

VIInput Clamp Voltage VCC eMin, IIeb

18 mA b1.5 V

VOH High Level Output VCC eMin, IOH eMax, 2.7 3.4 V

Voltage VIL eMax

VOL Low Level Output VCC eMin, IOL eMax, 0.35 0.5

Voltage VIH eMin V

IOL e4 mA, VCC eMin 0.25 0.4

IIInput Current @Max VCC eMax, VIe7V 1mA

Input Voltage

IIH High Level Input Current VCC eMax, VIe2.7V 20 mA

IIL Low Level Input Current VCC eMax, VIe0.4V b0.4 mA

IOS Short Circuit VCC eMax b30 b130 mA

Output Current (Note 2)

ICC Supply Current VCC eMax 50 mA

IOZH TRI-STATE Output VCC eVCCH 20 mA

off Current High VOZH e2.7V

IOZL TRI-STATE Output VCC eVCCH b20 mA

off Current Low VOZL e0.4V

Note 1: All typicals are at VCC e5V, TAe25§C.

Note 2: Not more than one output should be shorted at a time, and the duration should not exceed one second.

Switching Characteristics

at VCC e5V and TAe25§C (see Section 1 for Test Waveforms and output loading)

RLe2kX,

Symbol Parameter CLe50 pF Units

Min Max

tPLH Propagation Delay 27 ns

tPHL Data to Q 18

tPLH Propagation Delay 36 ns

tPHL LE to Q 25

tPZH TRI-STATE Enable Time 20 ns

tPZL OE to Q 25

tPHZ TRI-STATE Enable Time 20 ns

tPLZ OE to Q 25

ts(H) Setup Time (High/Low) 3 ns

ts(L) Data to LE 7

th(H) Hold Time (High/Low) 10 ns

th(L) Data to LE 10

tw(H) Pulse Width (High) 15 ns

Data to LE

Physical Dimensions inches (millimeters)

20-Lead Wide Small Outline Molded Package (M)

Order Number DM74LS573WM

NS Package Number M20B

DM74LS573 Octal D Latch with TRI-STATE Outputs

Physical Dimensions inches (millimeters) (Continued)

20-Lead Molded Dual-In-Line Package (N)

Order Number DM74LS573N

NS Package Number N20A

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SEMICONDUCTOR CORPORATION. As used herein:

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into the body, or (b) support or sustain life, and whose be reasonably expected to cause the failure of the life

failure to perform, when properly used in accordance support device or system, or to affect its safety or

with instructions for use provided in the labeling, can effectiveness.

be reasonably expected to result in a significant injury

to the user.

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